Analysis and solution on squeak noise of small permanent-magnet DC brush motors in variable speed applications

Y. B. Li, Siu Lau Ho, Weinong Fu, B. F. Xue

Research output: Journal article publicationJournal articleAcademic researchpeer-review

30 Citations (Scopus)


The phenomenon of squeaking noise, based on noise spectra data during the running up of a small permanent-magnet DC (PMDC) brush motor, is analyzed. From the analysis, it is found that apart from some mechanical issues, the major contributor of the squeaking noise of PMDC is the unbalanced magnetic radial force. In this study, the unbalanced magnetic radial force is simulated using finite- element analysis (FEA). A simple but effective method to reduce the noise is proposed. The improved method is validated by test results.
Original languageEnglish
Article number5257030
Pages (from-to)4752-4755
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 1 Oct 2009


  • Finite-element analysis
  • Permanent magnet
  • PMDC motor
  • Squeak noise
  • Unbalanced magnetic radial force

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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